You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
295 lines
6.2 KiB
295 lines
6.2 KiB
/***************************************************************************
|
|
* Copyright (C) 2005 by Joris Guisson *
|
|
* joris.guisson@gmail.com *
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
* This program is distributed in the hope that it will be useful, *
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
|
|
* GNU General Public License for more details. *
|
|
* *
|
|
* You should have received a copy of the GNU General Public License *
|
|
* along with this program; if not, write to the *
|
|
* Free Software Foundation, Inc., *
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
|
|
***************************************************************************/
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <errno.h>
|
|
#include <tqfile.h>
|
|
#include <tdefileitem.h>
|
|
#include <tdeio/netaccess.h>
|
|
#include <tdelocale.h>
|
|
#include <util/error.h>
|
|
#include <util/log.h>
|
|
#include <torrent/globals.h>
|
|
#include "mmapfile.h"
|
|
|
|
namespace bt
|
|
{
|
|
|
|
MMapFile::MMapFile() : fd(-1),data(0),size(0),file_size(0),ptr(0),mode(READ)
|
|
{}
|
|
|
|
|
|
MMapFile::~MMapFile()
|
|
{
|
|
if (fd > 0)
|
|
close();
|
|
}
|
|
|
|
bool MMapFile::open(const TQString & file,Mode mode)
|
|
{
|
|
#if HAVE_STAT64
|
|
struct stat64 sb;
|
|
stat64(TQFile::encodeName(file),&sb);
|
|
#else
|
|
struct stat sb;
|
|
stat(TQFile::encodeName(file),&sb);
|
|
#endif
|
|
|
|
return open(file,mode,(Uint64)sb.st_size);
|
|
}
|
|
|
|
bool MMapFile::open(const TQString & file,Mode mode,Uint64 size)
|
|
{
|
|
// close already open file
|
|
if (fd > 0)
|
|
close();
|
|
|
|
// setup flags
|
|
int flag = 0,mmap_flag = 0;
|
|
switch (mode)
|
|
{
|
|
case READ:
|
|
flag = O_RDONLY;
|
|
mmap_flag = PROT_READ;
|
|
break;
|
|
case WRITE:
|
|
flag = O_WRONLY | O_CREAT;
|
|
mmap_flag = PROT_WRITE;
|
|
break;
|
|
case RW:
|
|
flag = O_RDWR | O_CREAT;
|
|
mmap_flag = PROT_READ|PROT_WRITE;
|
|
break;
|
|
}
|
|
|
|
// Not all systems have O_LARGEFILE as an explicit flag
|
|
// (for instance, FreeBSD. Solaris does, but only if
|
|
// _LARGEFILE_SOURCE is defined in the compile).
|
|
// So OR it in if it is defined.
|
|
#ifdef O_LARGEFILE
|
|
flag |= O_LARGEFILE;
|
|
#endif
|
|
|
|
// open the file
|
|
fd = ::open(TQFile::encodeName(file) , flag);//(int)flag);
|
|
if (fd == -1)
|
|
return false;
|
|
|
|
// read the file size
|
|
this->size = size;
|
|
this->mode = mode;
|
|
|
|
#if HAVE_STAT64
|
|
struct stat64 sb;
|
|
stat64(TQFile::encodeName(file),&sb);
|
|
#else
|
|
struct stat sb;
|
|
stat(TQFile::encodeName(file),&sb);
|
|
#endif
|
|
file_size = (Uint64)sb.st_size;
|
|
filename = file;
|
|
|
|
// mmap the file
|
|
#if HAVE_MMAP64
|
|
data = (Uint8*)mmap64(0, size, mmap_flag, MAP_SHARED, fd, 0);
|
|
#else
|
|
data = (Uint8*)mmap(0, size, mmap_flag, MAP_SHARED, fd, 0);
|
|
#endif
|
|
if (data == MAP_FAILED)
|
|
{
|
|
::close(fd);
|
|
data = 0;
|
|
fd = -1;
|
|
ptr = 0;
|
|
return false;
|
|
}
|
|
ptr = 0;
|
|
return true;
|
|
}
|
|
|
|
void MMapFile::close()
|
|
{
|
|
if (fd > 0)
|
|
{
|
|
#if HAVE_MUNMAP64
|
|
munmap64(data,size);
|
|
#else
|
|
munmap(data,size);
|
|
#endif
|
|
::close(fd);
|
|
ptr = size = 0;
|
|
data = 0;
|
|
fd = -1;
|
|
filename = TQString();
|
|
}
|
|
}
|
|
|
|
void MMapFile::flush()
|
|
{
|
|
if (fd > 0)
|
|
msync(data,size,MS_SYNC);
|
|
}
|
|
|
|
Uint32 MMapFile::write(const void* buf,Uint32 buf_size)
|
|
{
|
|
if (fd == -1 || mode == READ)
|
|
return 0;
|
|
|
|
// check if data fits in memory mapping
|
|
if (ptr + buf_size > size)
|
|
throw Error(i18n("Cannot write beyond end of the mmap buffer!"));
|
|
|
|
Out() << "MMapFile::write : " << (ptr + buf_size) << " " << file_size << endl;
|
|
// enlarge the file if necessary
|
|
if (ptr + buf_size > file_size)
|
|
{
|
|
growFile(ptr + buf_size);
|
|
}
|
|
|
|
// memcpy data
|
|
memcpy(&data[ptr],buf,buf_size);
|
|
// update ptr
|
|
ptr += buf_size;
|
|
// update file size if necessary
|
|
if (ptr >= size)
|
|
size = ptr;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
void MMapFile::growFile(Uint64 new_size)
|
|
{
|
|
Out() << "Growing file to " << new_size << " bytes " << endl;
|
|
Uint64 to_write = new_size - file_size;
|
|
ssize_t written;
|
|
// jump to the end of the file
|
|
lseek(fd,0,SEEK_END);
|
|
|
|
Uint8 buf[1024];
|
|
memset(buf,0,1024);
|
|
// write data until to_write is 0
|
|
while (to_write > 0)
|
|
{
|
|
ssize_t w = ::write(fd,buf, to_write > 1024 ? 1024 : to_write);
|
|
if (w > 0)
|
|
to_write -= w;
|
|
else if (w < 0)
|
|
break;
|
|
}
|
|
file_size = new_size;
|
|
}
|
|
|
|
Uint32 MMapFile::read(void* buf,Uint32 buf_size)
|
|
{
|
|
if (fd == -1 || mode == WRITE)
|
|
return 0;
|
|
|
|
// check if we aren't going to read past the end of the file
|
|
Uint32 to_read = ptr + buf_size >= size ? size - ptr : buf_size;
|
|
// read data
|
|
memcpy(buf,data+ptr,to_read);
|
|
ptr += to_read;
|
|
return to_read;
|
|
}
|
|
|
|
Uint64 MMapFile::seek(SeekPos from,Int64 num)
|
|
{
|
|
switch (from)
|
|
{
|
|
case BEGIN:
|
|
if (num > 0)
|
|
ptr = num;
|
|
if (ptr >= size)
|
|
ptr = size - 1;
|
|
break;
|
|
case END:
|
|
{
|
|
Int64 np = (size - 1) + num;
|
|
if (np < 0)
|
|
{
|
|
ptr = 0;
|
|
break;
|
|
}
|
|
if (np >= (Int64) size)
|
|
{
|
|
ptr = size - 1;
|
|
break;
|
|
}
|
|
ptr = np;
|
|
}
|
|
break;
|
|
case CURRENT:
|
|
{
|
|
Int64 np = ptr + num;
|
|
if (np < 0)
|
|
{
|
|
ptr = 0;
|
|
break;
|
|
}
|
|
if (np >= (Int64) size)
|
|
{
|
|
ptr = size - 1;
|
|
break;
|
|
}
|
|
ptr = np;
|
|
}
|
|
break;
|
|
}
|
|
return ptr;
|
|
}
|
|
|
|
bool MMapFile::eof() const
|
|
{
|
|
return ptr >= size;
|
|
}
|
|
|
|
Uint64 MMapFile::tell() const
|
|
{
|
|
return ptr;
|
|
}
|
|
|
|
TQString MMapFile::errorString() const
|
|
{
|
|
return strerror(errno);
|
|
}
|
|
|
|
Uint64 MMapFile::getSize() const
|
|
{
|
|
return size;
|
|
}
|
|
|
|
Uint8* MMapFile::getData(Uint64 off)
|
|
{
|
|
if (off >= size)
|
|
return 0;
|
|
return &data[off];
|
|
}
|
|
}
|
|
|